new: Clear command to clear queue and stop playing!

src/main/java/codes/ztereohype/ztereomusic/command/commands/Clear.java

@@ -0,0 +1,45 @@
+package codes.ztereohype.ztereomusic.command.commands;
+
+import codes.ztereohype.ztereomusic.audio.TrackManager;
+import codes.ztereohype.ztereomusic.audio.TrackManagers;
+import codes.ztereohype.ztereomusic.command.Command;
+import codes.ztereohype.ztereomusic.command.CommandMeta;
+import codes.ztereohype.ztereomusic.command.permissions.VoiceChecks;
+import lombok.Getter;
+import net.dv8tion.jda.api.entities.Guild;
+import net.dv8tion.jda.api.entities.MessageChannel;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+
+public class Clear implements Command {
+    private @Getter final CommandMeta meta;
+
+    public Clear() {
+        this.meta = CommandMeta.builder()
+                                .name("clear")
+                                .aliases(new String[] {"deleteall"})
+                                .description("Clears the queue and stops playing.")
+                                .isNsfw(false)
+                                .isHidden(false)
+                                .checks(new VoiceChecks[] { VoiceChecks.BOT_CONNECTED,
+                                                            VoiceChecks.BOT_PLAYING,
+                                                            VoiceChecks.USER_CONNECTED,
+                                                            VoiceChecks.SAME_VC_IF_CONNECTED })
+                                .build();
+    }
+
+    @Override
+    public void execute(MessageReceivedEvent messageEvent, String[] args) {
+        Guild guild = messageEvent.getGuild();
+        MessageChannel messageChannel = messageEvent.getChannel();
+        TrackManager trackManager = TrackManagers.getGuildTrackManager(guild, messageChannel);
+
+        assert trackManager != null; // the command will not execute if it is anyway because of our VoiceChecks (BOT_PLAYING)
+
+        int tracksLeft = trackManager.trackQueue.size();
+        for (int i = 0; i < tracksLeft; i++) {
+            trackManager.removeQueueItem(0);
+        }
+        trackManager.stop();
+        messageChannel.sendMessage("The queue has been cleared").queue();
+    }
+}